Purification and characterization of latent polyphenol oxidase from truffles (Terfezia arenaria)

•Polyphenol oxidase from truffles was purified and characterized.•PPO showed best affinity for catechol as substrate and stability under wide range of pH and temperature.•Cu+2, SDS, sarkosyl and Triton X100 activate latent form of enzyme.•AL+3, Kojic acid, L-cysteine, Metabisulfite sodium and sodium...

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Published in:International journal of biological macromolecules Vol. 145; pp. 885 - 893
Main Authors: Benaceur, Farouk, Chaibi, Rachid, Berrabah, Fethi, Neifar, Aref, Leboukh, Mourad, Benaceur, Kenza, Nouioua, Wafa, Rezzoug, Asmaa, Bouazzara, Houria, Gouzi, Hicham, Cabana, Hubert, Gargouri, Ali
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Language:English
Published: Netherlands Elsevier B.V 15-02-2020
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Abstract •Polyphenol oxidase from truffles was purified and characterized.•PPO showed best affinity for catechol as substrate and stability under wide range of pH and temperature.•Cu+2, SDS, sarkosyl and Triton X100 activate latent form of enzyme.•AL+3, Kojic acid, L-cysteine, Metabisulfite sodium and sodium fluoride were excellent PPO inhibitors.•Kojic acid amplify heat sensitivity of enzyme and reduce loss of antioxidant potential. The polyphenol oxidase was extracted and purified from truffles (Terfezia arenaria) and it exhibited a molecular weight of 67 kDa. The truffle PPO was able to oxidize monophenolic, o-diphenolic and triphenolic substrates. Thus, the enzyme seems to be stable under wide range of pH and temperature. Best catalytic efficiency was observed for catechol as substrate (Kcat/km; 674.2 S−1 mM−1).The effect of detergents, chaotropic agents, metal ions and eleven different inhibitors on relative activity of Truffles PPO was also investigated. A latent form of enzyme was observed and its activity was stimulated using 4 mM of SDS. Likewise, the type of inhibition and the values of KI and IC50 were reported for L-cysteine, Sodium fluoride, sodium metabisulfite and kojic acid. Besides, the effect of four concentrations of kojic acid(0.05.,0.1.,0.2 and 0.3 mM) on thermal inactivation of PPO was performed in temperature range “ 60–75° C”. The use of Kojic acid increase the rate of inactivation process and disrupt enzymatic activity. Moreover, the combined effect of temperature and kojic acid prevent from enzymatic browning reaction and maintain high antioxidant activities including ABTS scavenging activity, FRAP, and total phenolic contents.
AbstractList •Polyphenol oxidase from truffles was purified and characterized.•PPO showed best affinity for catechol as substrate and stability under wide range of pH and temperature.•Cu+2, SDS, sarkosyl and Triton X100 activate latent form of enzyme.•AL+3, Kojic acid, L-cysteine, Metabisulfite sodium and sodium fluoride were excellent PPO inhibitors.•Kojic acid amplify heat sensitivity of enzyme and reduce loss of antioxidant potential. The polyphenol oxidase was extracted and purified from truffles (Terfezia arenaria) and it exhibited a molecular weight of 67 kDa. The truffle PPO was able to oxidize monophenolic, o-diphenolic and triphenolic substrates. Thus, the enzyme seems to be stable under wide range of pH and temperature. Best catalytic efficiency was observed for catechol as substrate (Kcat/km; 674.2 S−1 mM−1).The effect of detergents, chaotropic agents, metal ions and eleven different inhibitors on relative activity of Truffles PPO was also investigated. A latent form of enzyme was observed and its activity was stimulated using 4 mM of SDS. Likewise, the type of inhibition and the values of KI and IC50 were reported for L-cysteine, Sodium fluoride, sodium metabisulfite and kojic acid. Besides, the effect of four concentrations of kojic acid(0.05.,0.1.,0.2 and 0.3 mM) on thermal inactivation of PPO was performed in temperature range “ 60–75° C”. The use of Kojic acid increase the rate of inactivation process and disrupt enzymatic activity. Moreover, the combined effect of temperature and kojic acid prevent from enzymatic browning reaction and maintain high antioxidant activities including ABTS scavenging activity, FRAP, and total phenolic contents.
The polyphenol oxidase was extracted and purified from truffles (Terfezia arenaria) and it exhibited a molecular weight of 67 kDa. The truffle PPO was able to oxidize monophenolic, o-diphenolic and triphenolic substrates. Thus, the enzyme seems to be stable under wide range of pH and temperature. Best catalytic efficiency was observed for catechol as substrate (Kcat/km; 674.2 S  mM ).The effect of detergents, chaotropic agents, metal ions and eleven different inhibitors on relative activity of Truffles PPO was also investigated. A latent form of enzyme was observed and its activity was stimulated using 4 mM of SDS. Likewise, the type of inhibition and the values of K and IC were reported for L-cysteine, Sodium fluoride, sodium metabisulfite and kojic acid. Besides, the effect of four concentrations of kojic acid(0.05.,0.1.,0.2 and 0.3 mM) on thermal inactivation of PPO was performed in temperature range " 60-75° C". The use of Kojic acid increase the rate of inactivation process and disrupt enzymatic activity. Moreover, the combined effect of temperature and kojic acid prevent from enzymatic browning reaction and maintain high antioxidant activities including ABTS scavenging activity, FRAP, and total phenolic contents.
Author Gouzi, Hicham
Benaceur, Kenza
Gargouri, Ali
Nouioua, Wafa
Neifar, Aref
Benaceur, Farouk
Chaibi, Rachid
Rezzoug, Asmaa
Leboukh, Mourad
Cabana, Hubert
Berrabah, Fethi
Bouazzara, Houria
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Keywords Purification, characterization
Truffles
kojic acid.enzymatic browning
Polyphenol oxidase
Language English
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Snippet •Polyphenol oxidase from truffles was purified and characterized.•PPO showed best affinity for catechol as substrate and stability under wide range of pH and...
The polyphenol oxidase was extracted and purified from truffles (Terfezia arenaria) and it exhibited a molecular weight of 67 kDa. The truffle PPO was able to...
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SubjectTerms kojic acid.enzymatic browning
Polyphenol oxidase
Purification, characterization
Truffles
Title Purification and characterization of latent polyphenol oxidase from truffles (Terfezia arenaria)
URI https://dx.doi.org/10.1016/j.ijbiomac.2019.09.126
https://www.ncbi.nlm.nih.gov/pubmed/31778703
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